Divisions
Activities in the various astronomical sub-disciplines are mostly coordinated through the IAU Scientific Divisions. These Divisions act as umbrellas for one or more IAU Commissions, each focusing on a narrower scientific or organizational theme.
- Division I Fundamental Astronomy
- Division II Sun & Heliosphere
- Division III Planetary Systems Sciences
- Division IV Stars
- Division V Variable Stars
- Division VI Interstellar Matter
- Division VII Galactic System
- Division VIII Galaxies & the Universe
- Division IX Optical & Infrared Techniques
- Division X Radio Astronomy
- Division XI Space & High Energy Astrophysics
- Division XII Union-Wide Activities
